District of Columbia. This is the "space" that the capitol of
the United States, Washington, sits in. It is not a state, nor is
it a province. It is a separate place that is part of the United
States, but not part of a state.
Another acronym is Direct Current. In the US, there are two
forms of electrical current, Alternating current and Direct
current. The average US home has alternating current as standard
wiring. Direct current is used in automobiles and some electronics
utilizing battery devices.